flake8: move the pinned version of flake8 up to 3.3.0

This just moves flake8 and related tools up to newer versions and fixes
the complaints associated with that.

We added to the list of flake8 ignores:
 H102: do not put vim info in source files
 H304: no relative imports

Also updates and pins the following in the flake8 environment:
  pep8:        1.7.0  => drop  (although hacking still pulls it in).
  pyflakes     1.1.0  => 1.5.0
  hacking      0.10.2 => 0.13.0
  flake8       2.5.4  => 3.3.0
  pycodestyle  none   => 2.3.1

1 files changed, 3 insertions, 2 deletions

diff --git a/tools/hacking.py b/tools/hacking.py
index 6c320935..e6a05136 100755
--- a/tools/hacking.py
+++ b/tools/hacking.py
@@ -165,7 +165,8 @@ if __name__ == "__main__":
         pep8._main()
     finally:
         if len(_missingImport) > 0:
-            print >> sys.stderr, ("%i imports missing in this test environment"
-                                  % len(_missingImport))
+            sys.stderr.write(
+                "%i imports missing in this test environment\n" %
+                len(_missingImport))
 
 # vi: ts=4 expandtab